Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Star-shaped PCL with one to five arms were synthesized by ROP. They have the same crystal structure as linear PCL, indicating that the central cores are located in amorphous regions. The influence of arm length and number on crystallization and melting behavior were studied by DSC, POM, and through the Avrami equation…
Abstract The hyperbranched polytriazole ( hb ‐PTA) containing second‐order nonlinear optical chromophore was synthesized through “ A 2 + B 3 ” approach based on “click reaction.” Its corresponding linear analogue ( l ‐PTA) was prepared for comparison. The hb ‐PTA has better solubility in common organic solvents than t…
A novel synthetic approach for the efficient fabrication of Janus silica particles was demonstrated by embedment of zero-dimensional colloids on one-dimensional polymer fiber surfaces, followed by the surface modification on the exposed silica hemispheres. Electrospinning of poly(methyl methacrylate) and poly(4-vinyl…
We report fluid-fluid and fluid-solid phase transitions of charge-stabilized polystyrene particles suspended in a binary liquid mixture of 3-methylpyridine and water. These thermally reversible phase transitions occur in the homogeneous phase of the binary liquid mixture below the coexistence temperature of the two li…
We present an ab initio analysis of polarization of multilayer graphene systems under applied electric fields. The effects of applied electric fields are calculated using a Berry phase approach within a plane-wave density functional formalism. We have determined polarizability values for graphene films and carbon nano…
Ultrathin, perforated, and freely suspended membranes with uniform nanopores in the range of tens of nanometers have been fabricated using a fast, simple method of spin-assisted layer-by-layer assembly on hydrophobic substrates. Membranes with thicknesses down to 20 nm were robust enough to be released from the sacrif…
Abstract Resol type resins were prepared in alkaline conditions (potassium hydroxide or potassium carbonate) using furfural obtained by acid hydrolysis of abundant renewable resources from agricultural and forestry waste residues. The structures of the resins were fully determined by 1 H, 13 C, and 2D NMR spectrometri…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHigh-Elongation Fiber Mats by Electrospinning of PolyoxymethyleneJian-Wei Lu, Zhan-Peng Zhang, Xiang-Zhong Ren, Yi-Zhang Chen, Jian Yu, and Zhao-Xia Guo*View Author Information Institute of Polymer Science and Engineering, Departmen…
Recently, Liu et al. [Phys. Rev. B 74, 054435 (2006)] published the electronic structure of ${\text{Mn}}_{2}\text{NiGa}$ by using ab initio spin-polarized density functional theory. In the martensitic phase, they report a large decrease in Mn and Ni local magnetic moments to almost zero and a large increase in the den…
Spiders have evolved a complex system of silk producing glands. Each of the glands produces silk with strength and elasticity tailored to its biological purpose. Sequence analysis of the major ampullate silk reveals four highly conserved concatenated blocks of amino acids: (GA) n , A n , GPGXX, and GGX. While the GPGX…
The phase stabilities and structural and electronic properties of three zinc-based oxide alloy systems (Ca(x)Zn(1-x)O, Cd(x)Zn(1-x)O and Mg(x)Zn(1-x)O) are studied by first-principle methods. We examine all alloy configurations in three 16-atom supercells (1 × 1 × 2 B1 phase structure, 2 × 2 × 1 and 2 × 1 × 2 B4 phase…
We investigate the size dependence of the exciton-LO-phonon coupling strength in colloidal CdSe nanorods coated with an epitaxial ZnS shell. We find an increase in the coupling strength with decreasing nanorod diameter. The growth of a ZnS shell on the nanorod surface much more strongly reduces the exciton-phonon coup…
Abstract Superhydrophobic conducting polyaniline (PAni) films were electrochemically deposited in acetonitrile‐H 2 O electrolyte containing aniline monomer and perfluorooctanesulfonic (PFOS) acid. The films exhibited an extended network structure composed of helical PAni sub‐micron fibers. The helical fibrous structur…
The effects of impurities in room-temperature monoclinic ${\text{WO}}_{3}$ were studied by using the local density approximation to density-functional theory. Our main focus is on nitrogen impurity in ${\text{WO}}_{3}$, where both substitutional and interstitial cases were considered. We have also considered transitio…
Palladium(0) has been immobilized into the silica-based mesoporous material to develop catalyst Pd(0)-MCM-41, which is found to be highly active in carbon-carbon coupling reactions. [Pd(NH3)4]2+ ions have been incorporated into the mesoporous material during synthesis of MCM-41 and subsequently upon treatments with hy…
Dislocation dynamics simulations have been used to study the stress-strain response of single-crystal micropillars containing initial dislocation networks generated via a relaxation procedure intended to approximate real thermal annealing processes. We find that, when such networks are loaded, they exhibit periods of…
Ferroelectric nanostructures can be formed by local switching of domains using techniques such as piezo-force microscopy (PFM). Understanding lateral size effects is important to determine the minimum feature size for writing ferroelectric nanostructures. To understand these lateral size effects, we use the time-depen…
Abstract 10‐Ethyl‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide ( 1 ) can be nitrated using acetic anhydride and fuming nitric acid. The nitro group is reduced using palladium on charcoal and hydrogen. These reaction conditions are used for the synthesis of an analogous DOPO‐based diaminic hardener ( 7 ). An evaluation of the…
A resist-less nanofabrication method, based on focused ion beam lithography, for connecting and tailoring a nanometer-scale planar device in ultrathin graphitic disks is demonstrated by producing 50-nm-wide double side-gated transistor devices (see image). Experiments and theory suggest that the behavior of the nanori…
We have studied the effect of Fe addition on the structural and magnetic transitions in the magnetic shape memory alloy Ni-Mn-Ga by substituting systematically each atomic species by Fe. Calorimetric and ac susceptibility measurements have been carried out in order to study the magnetic and structural transformation p…